Table 3 Univariate and multivariate (stepwise forward conditional method) Cox model regression for allograft bone union and revisions after 2 years of follow-up

 Gender (male)

1.06 (0.56–1.99)

0.860

1.29 (0.38–4.32)

0.672

 Age (years)^b

0.99 (0.96–1.02)

0.460

1.01 (0.9–1.05)

0.790

 Resection length (mm)^b

1.00 (0.94–1.06)

0.967

0.98 (0.87–1.10)

0.705

 Irradiated allograft

0.68 (0.35–1.32)

0.256

3.57 (1.12–11.48)

0.031

 Adjuvant radiotherapy

0.32 (0.09–1.05)

0.061

2.63 (0.72–9.71)

0.144

 Adjuvant chemotherapy

1.05 (0.51–2.14)

0.894

1.10 (0.33–4.55)

0.759

  CHS (^cref.)

0.841

0.661

  OS

0.75 (0.28–1.98)

0.556

0.48 (0.14–1.67)

0.251

  Ewing’s

0.84 (0.29–2.43)

0.742

1.20 (0.14–11.11)

0.866

  VFG−: TG (^cref.)

0.026

0.025

  CBG

1.98 (0.85–4.49)

0.112

0.25 (0.03–2.00)

0.192

  VFG+

2.64 (1.28–5.44)

0.008

0.17 (0.04–0.80)

0.024

  Nail (^cref.)

0.149

0.095

  Plate

1.17 (0.54–2.51)

0.690

0.79 (0.13–4.98)

0.814

  Nail + plate

0.59 (0.27–1.30)

0.191

3.38 (0.83–12.82)

0.090

Multivariate analysis

Model p-value = 0.003

Model p-value = 0.010

Adjuvant RT

0.21 (0.06–0.74)

0.015

5.91 (1.19–29.38)

0.030

Irradiated allograft

6.00 (1.49–24.22)

0.012

Associated graft: VFG−: TG (^cref.)

0.004

 CBG

1.89 (0.80–4.44)

0.145

 VFG+

3.81 (1.68–8.64)

0.001